L2 Petition and I94 Expire on 11th Feb 2018 ...but EAD valid till Feb 2019.Can I work after 11th Feb 2018?

A person with employment based green card pending may not work on the L2 EAD after the expiration of the L-2 status.

How do the US authorities expect someone with a job to survive financially while waiting for approval of EAD?

In addition to attorney Behar's comment. I would remind you that the filing of and AOS EAD extension automatically provided continued employment...

I am renewing my DACA and I accidently drop part of 1 form in my car and sent out the rest. What can happen?

Most likely it would be rejected. But, it is possible for a request of the missing page.

On occasion USCIS separates G-28s from filings requiring the attorney to interfile a G-28.

What is the solution?

A person on a tourist visa who didn't apply the marriage license after 2 months is but one of the factors to be considered. Consult an immigration...

A student might come to the US for admission in valid F-1 status. A student in the US might have an I-130 filed on his/her behalf.

Can an Adjustment of Status be filed for a new immigrant visa application when the applicants previously held green cards?

A person that enters the US as a visitor with the intent to remain permanently is a misrepresentation of intent and considered immigration fraud.

If a previous employer has gone out of business, should I still list the address for that employer when I left?

If a previous employer has gone out of business, the N-400 applicant should still list the address for that employer when last employed there.

Change of Address?

It is ok to report again a change of address with the old address to new address with USCIS.

Should I go to CBP office for this ?

The I-94 that is the latest governs. If you have not traveled the I-94 at the bottom of the I-797 approval governs. CBP would not update a record...